营销型网站模板,邢台企业网站制作建设,怎么宣传自己的平台,深圳代理记账公司收费标准常见的几种加密方法和实常见的几种加密方法 #xff1a;MD5SHA1RSAAESDES1、MD5加密 是HASH算法一种、 是生成32位的数字字母混合码。 MD5主要特点是 不可逆MD5算法还具有以下性质#xff1a;1、压缩性#xff1a;任意长度的数据#xff0c;算出的MD5值长度都是固定的。2、…常见的几种加密方法和实常见的几种加密方法 MD5SHA1RSAAESDES1、MD5加密 是HASH算法一种、 是生成32位的数字字母混合码。 MD5主要特点是 不可逆MD5算法还具有以下性质1、压缩性任意长度的数据算出的MD5值长度都是固定的。2、容易计算从原数据计算出MD5值很容易。3、抗修改性对原数据进行任何改动哪怕只修改1个字节所得到的MD5值都有很大区别。4、弱抗碰撞已知原数据和其MD5值想找到一个具有相同MD5值的数据(即伪造数据)是非常困难的。5、强抗碰撞想找到两个不同的数据使它们具有相同的MD5值是非常困难的。具体代码//输出小写- (NSString *)lowerMD5:(NSString *)inPutText{//传入参数,转化成charconst char *cStr [inPutText UTF8String];//开辟一个16字节的空间unsigned char result[CC_MD5_DIGEST_LENGTH];/*extern unsigned char * CC_MD5(const void *data, CC_LONG len, unsigned char *md)官方封装好的加密方法把str字符串转换成了32位的16进制数列(这个过程不可逆转) 存储到了md这个空间中*/CC_MD5(cStr, (CC_LONG)strlen(cStr), result);return [[NSString stringWithFormat:%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X,result[0], result[1], result[2], result[3],result[4], result[5], result[6], result[7],result[8], result[9], result[10], result[11],result[12], result[13], result[14], result[15]] lowercaseString]; //大小写注意}//输出大写- (NSString *)upperMD5:(NSString *)inPutText{//传入参数,转化成charconst char *cStr [inPutText UTF8String];//开辟一个16字节的空间unsigned char result[CC_MD5_DIGEST_LENGTH];/*extern unsigned char * CC_MD5(const void *data, CC_LONG len, unsigned char *md)官方封装好的加密方法把str字符串转换成了32位的16进制数列(这个过程不可逆转) 存储到了md这个空间中*/CC_MD5(cStr, (CC_LONG)strlen(cStr), result);return [[NSString stringWithFormat:%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X,result[0], result[1], result[2], result[3],result[4], result[5], result[6], result[7],result[8], result[9], result[10], result[11],result[12], result[13], result[14], result[15]] uppercaseString]; //大小写注意}调用 代码实现NSLog(小写%,[self lowerMD5:123456]);NSLog(大写%,[self upperMD5:123456]);为了让MD5码更加安全 我们现在都采用加盐盐要越长越乱得到的MD5码就很难查到。static NSString * salt asdfghjklpoiuytrewqzxcvbnm;NSLog(加盐小写%,[self lowerMD5:[123456 stringByAppendingString:salt]]);NSLog(加盐大写%,[self upperMD5:[123456 stringByAppendingString:salt]]);输出结果2018-11-27 15:27:12.0125900800 Encryption[12828:3995427]小写e10adc3949ba59abbe56e057f20f883e 2018-11-27 15:27:12.0127740800Encryption[12828:3995427] 大写E10ADC3949BA59ABBE56E057F20F883E2018-11-27 15:27:12.0129010800 Encryption[12828:3995427]加盐小写71d1bda9346fab4eea309f4ed74b8f80 2018-11-27 15:27:12.0131080800Encryption[12828:3995427] 加盐大写71D1BDA9346FAB4EEA309F4ED74B8F802、SHA1 算法是哈希算法的一种代码实现 //sha1- (NSString *)sha1:(NSString *)input{const char *cstr [input cStringUsingEncoding:NSUTF8StringEncoding];NSData *data [NSData dataWithBytes:cstr length:input.length];//使用对应的 CC_SHA1_DIGEST_LENGTH,CC_SHA224_DIGEST_LENGTH,CC_SHA256_DIGEST_LENGTH,CC_SHA384_DIGEST_LENGTH,CC_SHA512_DIGEST_LENGTH的长度分别是20,28,32,48,64。看你们需求选择对应的长度uint8_t digest[CC_SHA1_DIGEST_LENGTH];CC_SHA1(data.bytes, (unsigned int)data.length, digest);NSMutableString *output [NSMutableString stringWithCapacity:CC_SHA1_DIGEST_LENGTH * 2];for(int i0; i[output appendFormat:%02x, digest[i]];}NSLog(sha-----%,output);return output;}调用 代码实现 [self sha1:123456];运行结果 2018-11-27 15:27:12.0132370800 Encryption[12828:3995427]sha----7c4a8d09ca3762af61e59520943dc26494f8941b3、RSA 非对称加密算法 (公钥私钥生成步骤点击)非对称加密算法需要两个密钥公开密钥(publickey)和私有密钥(privatekey)公开密钥与私有密钥是一对用公开密钥对数据进行加密只有用对应的私有密钥才能解密特点非对称密码体制的特点算法强度复杂、安全性依赖于算法与密钥但是由于其算法复杂而使得加密解密速度没有对称加密解密的速度快对称密码体制中只有一种密钥并且是非公开的如果要解密就得让对方知道密钥。所以保证其安全性就是保证密钥的安全而非对称密钥体制有两种密钥其中一个是公开的这样就可以不需要像对称密码那样传输对方的密钥了具体代码.h// return base64 encoded string (NSString *)encryptString:(NSString *)str publicKey:(NSString *)pubKey;// return raw data (NSData *)encryptData:(NSData *)data publicKey:(NSString *)pubKey;// return base64 encoded string (NSString *)encryptString:(NSString *)str privateKey:(NSString *)privKey;// return raw data (NSData *)encryptData:(NSData *)data privateKey:(NSString *)privKey;// decrypt base64 encoded string, convert result to string(not base64 encoded) (NSString *)decryptString:(NSString *)str publicKey:(NSString *)pubKey; (NSData *)decryptData:(NSData *)data publicKey:(NSString *)pubKey; (NSString *)decryptString:(NSString *)str privateKey:(NSString *)privKey; (NSData *)decryptData:(NSData *)data privateKey:(NSString *)privKey;实现static NSString *base64_encode_data(NSData *data){data [data base64EncodedDataWithOptions:0];NSString *ret [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];return ret;}static NSData *base64_decode(NSString *str){NSData *data [[NSData alloc] initWithBase64EncodedString:str options:NSDataBase64DecodingIgnoreUnknownCharacters];return data;} (NSData *)stripPublicKeyHeader:(NSData *)d_key{// Skip ASN.1 public key headerif (d_key nil) return(nil);unsigned long len [d_key length];if (!len) return(nil);unsigned char *c_key (unsigned char *)[d_key bytes];unsigned int idx 0;if (c_key[idx] ! 0x30) return(nil);if (c_key[idx] 0x80) idx c_key[idx] - 0x80 1;else idx;// PKCS #1 rsaEncryption szOID_RSA_RSAstatic unsigned char seqiod[] { 0x30, 0x0d, 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x01,0x01, 0x05, 0x00 };if (memcmp(c_key[idx], seqiod, 15)) return(nil);idx 15;if (c_key[idx] ! 0x03) return(nil);if (c_key[idx] 0x80) idx c_key[idx] - 0x80 1;else idx;if (c_key[idx] ! \0) return(nil);// Now make a new NSData from this bufferreturn([NSData dataWithBytes:c_key[idx] length:len - idx]);} (NSData *)stripPrivateKeyHeader:(NSData *)d_key{// Skip ASN.1 private key headerif (d_key nil) return(nil);unsigned long len [d_key length];if (!len) return(nil);unsigned char *c_key (unsigned char *)[d_key bytes];unsigned int idx 22; //magic byte at offset 22if (0x04 ! c_key[idx]) return nil;unsigned int c_len c_key[idx];int det c_len 0x80;if (!det) {c_len c_len 0x7f;} else {int byteCount c_len 0x7f;if (byteCount idx len) {//rsa length field longer than bufferreturn nil;}unsigned int accum 0;unsigned char *ptr c_key[idx];idx byteCount;while (byteCount) {accum (accum 8) *ptr;ptr;byteCount--;}c_len accum;}// Now make a new NSData from this bufferreturn [d_key subdataWithRange:NSMakeRange(idx, c_len)];} (SecKeyRef)addPublicKey:(NSString *)key{NSRange spos [key rangeOfString:-----BEGIN PUBLIC KEY-----];NSRange epos [key rangeOfString:-----END PUBLIC KEY-----];if(spos.location ! NSNotFound epos.location ! NSNotFound){NSUInteger s spos.location spos.length;NSUInteger e epos.location;NSRange range NSMakeRange(s, e-s);key [key substringWithRange:range];}key [key stringByReplacingOccurrencesOfString:\r withString:];key [key stringByReplacingOccurrencesOfString:\n withString:];key [key stringByReplacingOccurrencesOfString:\t withString:];key [key stringByReplacingOccurrencesOfString: withString:];// This will be base64 encoded, decode it.NSData *data base64_decode(key);data [LHRSA stripPublicKeyHeader:data];if(!data){return nil;}//a tag to read/write keychain storageNSString *tag RSAUtil_PubKey;NSData *d_tag [NSData dataWithBytes:[tag UTF8String] length:[tag length]];// Delete any old lingering key with the same tagNSMutableDictionary *publicKey [[NSMutableDictionary alloc] init];[publicKey setObject:(__bridge id) kSecClassKey forKey:(__bridge id)kSecClass];[publicKey setObject:(__bridge id) kSecAttrKeyTypeRSA forKey:(__bridge id)kSecAttrKeyType];[publicKey setObject:d_tag forKey:(__bridge id)kSecAttrApplicationTag];SecItemDelete((__bridge CFDictionaryRef)publicKey);// Add persistent version of the key to system keychain[publicKey setObject:data forKey:(__bridge id)kSecValueData];[publicKey setObject:(__bridge id) kSecAttrKeyClassPublic forKey:(__bridge id)kSecAttrKeyClass];[publicKey setObject:[NSNumber numberWithBool:YES] forKey:(__bridge id)kSecReturnPersistentRef];CFTypeRef persistKey nil;OSStatus status SecItemAdd((__bridge CFDictionaryRef)publicKey, persistKey);if (persistKey ! nil){CFRelease(persistKey);}if ((status ! noErr) (status ! errSecDuplicateItem)) {return nil;}[publicKey removeObjectForKey:(__bridge id)kSecValueData];[publicKey removeObjectForKey:(__bridge id)kSecReturnPersistentRef];[publicKey setObject:[NSNumber numberWithBool:YES] forKey:(__bridge id)kSecReturnRef];[publicKey setObject:(__bridge id) kSecAttrKeyTypeRSA forKey:(__bridge id)kSecAttrKeyType];// Now fetch the SecKeyRef version of the keySecKeyRef keyRef nil;status SecItemCopyMatching((__bridge CFDictionaryRef)publicKey, (CFTypeRef *)keyRef);if(status ! noErr){return nil;}return keyRef;} (SecKeyRef)addPrivateKey:(NSString *)key{NSRange spos;NSRange epos;spos [key rangeOfString:-----BEGIN RSA PRIVATE KEY-----];if(spos.length 0){epos [key rangeOfString:-----END RSA PRIVATE KEY-----];}else{spos [key rangeOfString:-----BEGIN PRIVATE KEY-----];epos [key rangeOfString:-----END PRIVATE KEY-----];}if(spos.location ! NSNotFound epos.location ! NSNotFound){NSUInteger s spos.location spos.length;NSUInteger e epos.location;NSRange range NSMakeRange(s, e-s);key [key substringWithRange:range];}key [key stringByReplacingOccurrencesOfString:\r withString:];key [key stringByReplacingOccurrencesOfString:\n withString:];key [key stringByReplacingOccurrencesOfString:\t withString:];key [key stringByReplacingOccurrencesOfString: withString:];// This will be base64 encoded, decode it.NSData *data base64_decode(key);data [LHRSA stripPrivateKeyHeader:data];if(!data){return nil;}//a tag to read/write keychain storageNSString *tag RSAUtil_PrivKey;NSData *d_tag [NSData dataWithBytes:[tag UTF8String] length:[tag length]];// Delete any old lingering key with the same tagNSMutableDictionary *privateKey [[NSMutableDictionary alloc] init];[privateKey setObject:(__bridge id) kSecClassKey forKey:(__bridge id)kSecClass];[privateKey setObject:(__bridge id) kSecAttrKeyTypeRSA forKey:(__bridge id)kSecAttrKeyType];[privateKey setObject:d_tag forKey:(__bridge id)kSecAttrApplicationTag];SecItemDelete((__bridge CFDictionaryRef)privateKey);// Add persistent version of the key to system keychain[privateKey setObject:data forKey:(__bridge id)kSecValueData];[privateKey setObject:(__bridge id) kSecAttrKeyClassPrivate forKey:(__bridge id)kSecAttrKeyClass];[privateKey setObject:[NSNumber numberWithBool:YES] forKey:(__bridge id)kSecReturnPersistentRef];CFTypeRef persistKey nil;OSStatus status SecItemAdd((__bridge CFDictionaryRef)privateKey, persistKey);if (persistKey ! nil){CFRelease(persistKey);}if ((status ! noErr) (status ! errSecDuplicateItem)) {return nil;}[privateKey removeObjectForKey:(__bridge id)kSecValueData];[privateKey removeObjectForKey:(__bridge id)kSecReturnPersistentRef];[privateKey setObject:[NSNumber numberWithBool:YES] forKey:(__bridge id)kSecReturnRef];[privateKey setObject:(__bridge id) kSecAttrKeyTypeRSA forKey:(__bridge id)kSecAttrKeyType];// Now fetch the SecKeyRef version of the keySecKeyRef keyRef nil;status SecItemCopyMatching((__bridge CFDictionaryRef)privateKey, (CFTypeRef *)keyRef);if(status ! noErr){return nil;}return keyRef;}/* START: Encryption Decryption with RSA private key */ (NSData *)encryptData:(NSData *)data withKeyRef:(SecKeyRef) keyRef isSign:(BOOL)isSign {const uint8_t *srcbuf (const uint8_t *)[data bytes];size_t srclen (size_t)data.length;size_t block_size SecKeyGetBlockSize(keyRef) * sizeof(uint8_t);void *outbuf malloc(block_size);size_t src_block_size block_size - 11;NSMutableData *ret [[NSMutableData alloc] init];for(int idx0; idx//NSLog(%d/%d block_size: %d, idx, (int)srclen, (int)block_size);size_t data_len srclen - idx;if(data_len src_block_size){data_len src_block_size;}size_t outlen block_size;OSStatus status noErr;if (isSign) {status SecKeyRawSign(keyRef,kSecPaddingPKCS1,srcbuf idx,data_len,outbuf,outlen);} else {status SecKeyEncrypt(keyRef,kSecPaddingPKCS1,srcbuf idx,data_len,outbuf,outlen);}if (status ! 0) {NSLog(SecKeyEncrypt fail. Error Code: %d, status);ret nil;break;}else{[ret appendBytes:outbuf length:outlen];}}free(outbuf);CFRelease(keyRef);return ret;} (NSString *)encryptString:(NSString *)str privateKey:(NSString *)privKey{NSData *data [LHRSA encryptData:[str dataUsingEncoding:NSUTF8StringEncoding] privateKey:privKey];NSString *ret base64_encode_data(data);return ret;} (NSData *)encryptData:(NSData *)data privateKey:(NSString *)privKey{if(!data || !privKey){return nil;}SecKeyRef keyRef [LHRSA addPrivateKey:privKey];if(!keyRef){return nil;}return [LHRSA encryptData:data withKeyRef:keyRef isSign:YES];} (NSData *)decryptData:(NSData *)data withKeyRef:(SecKeyRef) keyRef{const uint8_t *srcbuf (const uint8_t *)[data bytes];size_t srclen (size_t)data.length;size_t block_size SecKeyGetBlockSize(keyRef) * sizeof(uint8_t);UInt8 *outbuf malloc(block_size);size_t src_block_size block_size;NSMutableData *ret [[NSMutableData alloc] init];for(int idx0; idx//NSLog(%d/%d block_size: %d, idx, (int)srclen, (int)block_size);size_t data_len srclen - idx;if(data_len src_block_size){data_len src_block_size;}size_t outlen block_size;OSStatus status noErr;status SecKeyDecrypt(keyRef,kSecPaddingNone,srcbuf idx,data_len,outbuf,outlen);if (status ! 0) {NSLog(SecKeyEncrypt fail. Error Code: %d, status);ret nil;break;}else{//the actual decrypted data is in the middle, locate it!int idxFirstZero -1;int idxNextZero (int)outlen;for ( int i 0; i outlen; i ) {if ( outbuf[i] 0 ) {if ( idxFirstZero 0 ) {idxFirstZero i;} else {idxNextZero i;break;}}}[ret appendBytes:outbuf[idxFirstZero1] length:idxNextZero-idxFirstZero-1];}}free(outbuf);CFRelease(keyRef);return ret;} (NSString *)decryptString:(NSString *)str privateKey:(NSString *)privKey{NSData *data [[NSData alloc] initWithBase64EncodedString:str options:NSDataBase64DecodingIgnoreUnknownCharacters];data [LHRSA decryptData:data privateKey:privKey];NSString *ret [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];return ret;} (NSData *)decryptData:(NSData *)data privateKey:(NSString *)privKey{if(!data || !privKey){return nil;}SecKeyRef keyRef [LHRSA addPrivateKey:privKey];if(!keyRef){return nil;}return [LHRSA decryptData:data withKeyRef:keyRef];}/* END: Encryption Decryption with RSA private key *//* START: Encryption Decryption with RSA public key */ (NSString *)encryptString:(NSString *)str publicKey:(NSString *)pubKey{NSData *data [LHRSA encryptData:[str dataUsingEncoding:NSUTF8StringEncoding] publicKey:pubKey];NSString *ret base64_encode_data(data);return ret;} (NSData *)encryptData:(NSData *)data publicKey:(NSString *)pubKey{if(!data || !pubKey){return nil;}SecKeyRef keyRef [LHRSA addPublicKey:pubKey];if(!keyRef){return nil;}return [LHRSA encryptData:data withKeyRef:keyRef isSign:NO];} (NSString *)decryptString:(NSString *)str publicKey:(NSString *)pubKey{NSData *data [[NSData alloc] initWithBase64EncodedString:str options:NSDataBase64DecodingIgnoreUnknownCharacters];data [LHRSA decryptData:data publicKey:pubKey];NSString *ret [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];return ret;} (NSData *)decryptData:(NSData *)data publicKey:(NSString *)pubKey{if(!data || !pubKey){return nil;}SecKeyRef keyRef [LHRSA addPublicKey:pubKey];if(!keyRef){return nil;}return [LHRSA decryptData:data withKeyRef:keyRef];}调用//公钥NSString *publicKey MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCVtz/hQUNiLE1prYofqLlmYtK0OupHN7wkZaeYVoQqk0v1w/MIUm20BGKNjVAo9ZBH7IDWSQ25Mhh9niizPULktWqvm5wWOwEy5R/dbjNmGDFCrFXC0gYAXI4uLhcVNGNWbu3mm3BVh9LmVUd3qr1ZxILkJ36x/VCe/vIQIDAQAB;//私钥NSString *privateKey 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;//要加密的数据NSString *sourceStr 123456;//公钥加密NSString *encryptStr [LHRSA encryptString:sourceStr publicKey:publicKey];//私钥解密NSString *decrypeStr [LHRSA decryptString:encryptStr privateKey:privateKey];NSLog(\n加密后的数据:% \n 解密后的数据:%,encryptStr,decrypeStr);运行结果 2018-11-27 15:27:13.0991520800 Encryption[12828:3995427]加密后的数据:FI/egBsrrGlneTT4vr6b6Q9slJ5zPJBhGx85kKEsfkbkvlh1DcVOW29vaCdPQ2klwIyjVOCFM9PoJRPa6h9RJX5h/ESEz2dD7ZAl2kEkvVr69Eg1KYzLhAlNagHiT1bMcXRIBfO99oyrJFqLQoWlLG3jURyXwjzQ7Lwc9rmU解密后的数据:1234564、AES 对称密钥加密加密代码实现引入 #import (NSData *)AES256EncryptWithKey:(NSString *)key encryptString:(NSString *)str{char keyPtr[kCCKeySizeAES2561]; // room for terminator (unused)bzero(keyPtr, sizeof(keyPtr)); // fill with zeroes (for padding)// fetch key data[key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];NSUInteger dataLength [str length];size_t bufferSize dataLength kCCBlockSizeAES128;void *buffer malloc(bufferSize);size_t numBytesEncrypted 0;CCCryptorStatus cryptStatus CCCrypt(kCCEncrypt, kCCAlgorithmAES128, kCCOptionPKCS7Padding,keyPtr, kCCKeySizeAES256,NULL /* initialization vector (optional) */,[[str dataUsingEncoding:NSUTF8StringEncoding] bytes], dataLength, /* input */buffer, bufferSize, /* output */numBytesEncrypted);if (cryptStatus kCCSuccess) {//the returned NSData takes ownership of the buffer and will free it on deallocationreturn [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted];}free(buffer); //free the buffer;return nil;} (NSData *)AES256DecryptWithKey:(NSString *)key DecryptString:(NSData *)str{// key should be 32 bytes for AES256, will be null-padded otherwisechar keyPtr[kCCKeySizeAES2561]; // room for terminator (unused)bzero(keyPtr, sizeof(keyPtr)); // fill with zeroes (for padding)// fetch key data[key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];NSUInteger dataLength [str length];size_t bufferSize dataLength kCCBlockSizeAES128;void *buffer malloc(bufferSize);size_t numBytesDecrypted 0;CCCryptorStatus cryptStatus CCCrypt(kCCDecrypt, kCCAlgorithmAES128, kCCOptionPKCS7Padding,keyPtr, kCCKeySizeAES256,NULL /* initialization vector (optional) */,[str bytes], dataLength, /* input */buffer, bufferSize, /* output */numBytesDecrypted);if (cryptStatus kCCSuccess) {//the returned NSData takes ownership of the buffer and will free it on deallocationreturn [NSData dataWithBytesNoCopy:buffer length:numBytesDecrypted];}free(buffer); //free the buffer;return nil;}调用代码//用来密钥NSString * key 123456;//用来发送的原始数据NSString * secret 654321;//用密钥加密NSData * result [LHAES AES256EncryptWithKey:key encryptString:secret];//输出测试NSLog(AES加密 :%,result);//解密方法NSData * data [LHAES AES256DecryptWithKey:key DecryptString:result];NSLog(AES解密 :%, [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]);运行结果2018-11-27 15:27:13.1001210800 Encryption[12828:3995427] AES加密:93d4cdab 759376b4 51565e57 85f684f6 2018-11-27 15:27:13.1002570800Encryption[12828:3995427] AES解密 :6543215、DES 加密 先将内容加密一下然后转十六进制传过去 DES解密 把收到的数据转二进制decode一下然后再解密得到原本的数据代码实现 引入 #import //加密 (NSString *) encryptUseDES2:(NSString *)content key:(NSString *)key{NSString *ciphertext nil;const char *textBytes [content UTF8String];size_t dataLength [content length];uint8_t *bufferPtr NULL;size_t bufferPtrSize 0;size_t movedBytes 0;bufferPtrSize (dataLength kCCBlockSizeDES) ~(kCCBlockSizeDES - 1);bufferPtr malloc( bufferPtrSize * sizeof(uint8_t));memset((void *)bufferPtr, 0x0, bufferPtrSize);CCCryptorStatus cryptStatus CCCrypt(kCCEncrypt, kCCAlgorithm3DES,kCCOptionPKCS7Padding|kCCOptionECBMode,[key UTF8String], kCCKeySize3DES,NULL,textBytes, dataLength,(void *)bufferPtr, bufferPtrSize,movedBytes);if (cryptStatus kCCSuccess) {ciphertext [self parseByte2HexString:bufferPtr :(int)movedBytes];}ciphertext[ciphertext uppercaseString];//字符变大写return ciphertext ;}//加密用到的二进制转化十六进制方法 (NSString *) parseByte2HexString:(Byte *) bytes :(int)len{NSString *hexStr ;if(bytes){for(int i0;i{NSString *newHexStr [NSString stringWithFormat:%x,bytes[i]0xff]; ///16进制数if([newHexStr length] 1)hexStr [NSString stringWithFormat:%0%,hexStr,newHexStr];else{hexStr [NSString stringWithFormat:%%,hexStr,newHexStr];}}}return hexStr;}//解密 (NSString *)decryptUseDES:(NSString *)content key:(NSString *)key{NSData* cipherData [self convertHexStrToData:[content lowercaseString]];unsigned char buffer[1024];memset(buffer, 0, sizeof(char));size_t numBytesDecrypted 0;CCCryptorStatus cryptStatus CCCrypt(kCCDecrypt,kCCAlgorithm3DES,kCCOptionPKCS7Padding|kCCOptionECBMode,[key UTF8String],kCCKeySize3DES,NULL,[cipherData bytes],[cipherData length],buffer,1024,numBytesDecrypted);NSString* plainText nil;if (cryptStatus kCCSuccess) {NSData* data [NSData dataWithBytes:buffer length:(NSUInteger)numBytesDecrypted];plainText [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];}return plainText;}//解密过程用到的十六进制转换二进制 (NSData *)convertHexStrToData:(NSString *)str {if (!str || [str length] 0) {return nil;}NSMutableData *hexData [[NSMutableData alloc] initWithCapacity:8];NSRange range;if ([str length] % 2 0) {range NSMakeRange(0, 2);} else {range NSMakeRange(0, 1);}for (NSInteger i range.location; i [str length]; i 2) {unsigned int anInt;NSString *hexCharStr [str substringWithRange:range];NSScanner *scanner [[NSScanner alloc] initWithString:hexCharStr];[scanner scanHexInt:anInt];NSData *entity [[NSData alloc] initWithBytes:anInt length:1];[hexData appendData:entity];range.location range.length;range.length 2;}return hexData;}调用代码//用来密钥NSString * keyDES 123456;//用来发送的原始数据NSString * secretDES 654321;NSString * resultDES [LHDES encryptUseDES2:secretDES key:keyDES];NSLog(DES加密 :%,resultDES);NSString * decryptResult [LHDES decryptUseDES:resultDES key:keyDES];NSLog(DES解密 :%,decryptResult);运行结果2018-11-27 15:27:13.1004550800 Encryption[12828:3995427] DES加密:CC1A2A7516D45169 2018-11-27 15:27:13.1006430800Encryption[12828:3995427] DES解密 :654321
